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First of all, go to service.us.panasonic.com/operman to get the manual for your unit.

With the unit turned on and the clock displayed, pres disp for more than two seconds. The hours will blink... press < or > to adjust hour. Press disp again, the minutes will blink... press < or > to adjust minutes. Lastly, press disp to store the correct time. Good Luck!!!

You can find a copy of the manual at http://www2.panasonic.com/webapp/wcs/stores/servlet/vModelDetail?surfModel=CQ-C5305U&catalogId=13401&cachePartner=7000000000000005702&modelNo=CQ-C5305U&itemId=112163&catGroupId=25028&surfCategory=CD+Receivers&cacheProgram=11002&storeId=15001&displayTab=R
It has the instructions in it on how to set the clock.

here is the link to the manual in english;
http://techdocs.panasonic.co.uk/docs/1z46a4f025z3z24291z656ez706466z24z2def662d62b6933e74fc7f95e0899332503cee99/tsn2/data/EUOT/CQC1021NW/OI/769432/YFM284C454ZC_ENG.pdf
Check page 1 - right in the top right corner under "Preparation"
Hope this helps :)